"US could intensify collaboration with Russia on Iran issue, US President emphasized, stressing the importance of Russia's role and USA's interest in closer collaboration," Russia's Ambassador to US, Yuri Ushakov told at the briefing on recent talks between RA Prime Minister Vladimir Putin and Barack Obama.

According to Ushakov, talks focused on Iran issues as well as nuclear problem in Korea.

"Obama gave high assessment on Russia-US collaboration in this sphere," Interfax cited Ushakov as saying.